空氣電磁加熱器影響因素

      1.增大空氣加熱器的氣體入口流速，能夠加強空氣電加熱器對流換熱(re)(re)(re)，而降(jiang)低了空氣(qi)加(jia)熱(re)(re)(re)器內電(dian)熱(re)(re)(re)元件表面溫(wen)度，不(bu)僅有(you)利于(yu)延(yan)長空氣(qi)加(jia)熱(re)(re)(re)器電(dian)熱(re)(re)(re)元件的使(shi)用壽命，而且(qie)使(shi)得空氣(qi)電(dian)加(jia)熱(re)(re)(re)器散熱(re)(re)(re)損失(shi)減小(xiao)，因而空氣(qi)換熱(re)(re)(re)器的效(xiao)率提(ti)高了，但速度如(ru)果(guo)過大，使(shi)得壓力損失(shi)陡增，這(zhe)將不(bu)利于(yu)加(jia)熱(re)(re)(re)效(xiao)率的提(ti)高。

     2.若其(qi)它(ta)條件(jian)(jian)(jian)(jian)不變，改變表(biao)(biao)面(mian)負(fu)荷，空氣加熱(re)(re)(re)器(qi)中電熱(re)(re)(re)元(yuan)(yuan)件(jian)(jian)(jian)(jian)的壁(bi)溫將(jiang)(jiang)(jiang)呈直線變化，如(ru)果表(biao)(biao)面(mian)負(fu)荷增大，電熱(re)(re)(re)元(yuan)(yuan)件(jian)(jian)(jian)(jian)的壁(bi)溫將(jiang)(jiang)(jiang)增大，這將(jiang)(jiang)(jiang)降(jiang)低空氣加熱(re)(re)(re)器(qi)中電熱(re)(re)(re)元(yuan)(yuan)件(jian)(jian)(jian)(jian)的使用壽命，但是如(ru)果表(biao)(biao)面(mian)負(fu)荷過(guo)小，壁(bi)溫過(guo)低，空氣加熱(re)(re)(re)器(qi)換熱(re)(re)(re)器(qi)的效率又降(jiang)低了，所以空氣加熱(re)(re)(re)器(qi)中電熱(re)(re)(re)元(yuan)(yuan)件(jian)(jian)(jian)(jian)的表(biao)(biao)面(mian)負(fu)荷的選擇比較重要。

     3.空氣(qi)(qi)(qi)加(jia)熱(re)(re)(re)器中(zhong)空氣(qi)(qi)(qi)終溫(wen)T2提高(gao)(gao)時，由于空氣(qi)(qi)(qi)粘(zhan)性增(zeng)加(jia)，氣(qi)(qi)(qi)體(ti)雷諾(nuo)數減小，使得對流換熱(re)(re)(re)強度(du)降低(di)，空氣(qi)(qi)(qi)加(jia)熱(re)(re)(re)器中(zhong)電(dian)熱(re)(re)(re)元(yuan)件(jian)的(de)(de)表面(mian)溫(wen)度(du)同時上(shang)升，紅外(wai)碳硫分析儀使得散熱(re)(re)(re)損失增(zeng)加(jia)，從而(er)降低(di)換熱(re)(re)(re)器的(de)(de)效(xiao)率。當T2提高(gao)(gao)過大時，電(dian)熱(re)(re)(re)元(yuan)件(jian)表面(mian)的(de)(de)溫(wen)度(du)亦會大大升高(gao)(gao)，致使一般電(dian)熱(re)(re)(re)元(yuan)件(jian)無法承受，故(gu)T2的(de)(de)增(zeng)加(jia)通常(chang)受到(dao)空氣(qi)(qi)(qi)加(jia)熱(re)(re)(re)器中(zhong)電(dian)熱(re)(re)(re)元(yuan)件(jian)材料耐熱(re)(re)(re)性能的(de)(de)限制。